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Welcome aboard, It could be power steering pump, belt, idler pulley, steering box(at base of steering shaft). Left only sounds kinda like steer box though...
 

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i think its the belt or steering box one of thoes. well saturday im going to change the difference fluid so i mind as well look at the belt and the box what should i look for? and where is the belt? is the belt near the power steering pump?
Check fluid level is good and not discoloured. Check lines in/out of power steering pump for cracks. Yours should be a serpentine belt. Steering box is at base of steering column on frame rail.
 

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If you have a buddy helping you put front end up on axel stands (safely) just so weight is off front end get your buddy to move the wheel while you look under hood. Don't wear loose clothing and watch where your putting your hands. You might find it faster that way.
Good luck, post back your findings...
 

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My 2004 Suburban had a clunking noise coming from the steering column when turning left. There is a coupler for the collapsible steering column that needed to be repacked with grease. I took it to my local Chevy dealer and they said that it is common on '99 and up GM trucks. They repacked it and it has been good but they said it will happen again in time. Hopefully that is all it is on yours.
Nice work, thanks for posting. Very good advice in where to look first.
 
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